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Algae may replace fish oil in salmon feed

Fish oil is an ideal source of omega-3 in salmon feed, but the capacity to produce farmed salmon using fish oil as the main source of omega-3 in feed is limited, if the farmed salmon itself is to remain a rich source of omega-3. This means that the salmon feed industry needs access to large volumes of new ingredients that contain omega-3. Experiments at Nofima have shown that a type of algae known as “heterotrophic algae” can fully replace fish oil in feed used for small salmon.

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Salmon genes can give more omega-3

The scientists believe the level of omega-3 in the salmon we eat is determined by a combination of the salmon’s genes and the feed it eats.
There is less omega-3 in the fillet when salmon are fed plant-based feed. However, the scientists know that salmon have a certain capacity to convert omega-3 fatty acids from plant oil to marine omega-3. They will now receive help from the salmon’s genes to increase this capacity.

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